No criminal charges have yet to be filed against the woman, whose name hasn’t been released. The case will go to a grand jury for review.

Keen had taken a cab home after a night of St. Patrick’s Day drinking just before the shooting occurred.

The Montgomery County (Texas) Sheriff’s Office told KHOU that the Porter area shooting occurred after the woman heard a noise on her front porch at around 9:30 p.m. and saw a man outside.

The woman claimed the man kept trying to get into her house and she warned him to leave and that she had a gun.

When the man continued trying to get inside her home, the woman fired two shots through the door and called 911.

Keen was hit and died later at a Houston hospital.

"No one did anything wrong. It was just a confluence of events that provoked a tragedy," Houston Mayor Annise Parker told KHOU. "My understanding is that the firefighter, off-duty, had been out. He did what he was supposed to do: he took a cab ride home, got dropped off in the wrong place and wasn’t aware of it. Tried to get into what he thought was his house and was tragically shot. "

CBS News reported Keen was a newly wed who had moved in next door about a year ago. He was a former Marine and had served as a Houston firefighter since 2010.